Improved GPU/Neuron profiling; fixed encoding issue

What's Changed

• Don't change JIT behavior on Neuron by @emeryberger in #896
• Optimized implementation to use IOKit directly by @emeryberger in #897
• Fix UTF-8 encoding issue, resolving #899 by @emeryberger in #900

Full Changelog: v1.5.49...v1.5.50